JPS56121022A - Automatic dimming strobe device - Google Patents
Automatic dimming strobe deviceInfo
- Publication number
- JPS56121022A JPS56121022A JP2387280A JP2387280A JPS56121022A JP S56121022 A JPS56121022 A JP S56121022A JP 2387280 A JP2387280 A JP 2387280A JP 2387280 A JP2387280 A JP 2387280A JP S56121022 A JPS56121022 A JP S56121022A
- Authority
- JP
- Japan
- Prior art keywords
- capacitor
- charging voltage
- voltage
- main
- amplifier
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
- H05B41/14—Circuit arrangements
- H05B41/30—Circuit arrangements in which the lamp is fed by pulses, e.g. flash lamp
- H05B41/32—Circuit arrangements in which the lamp is fed by pulses, e.g. flash lamp for single flash operation
- H05B41/325—Circuit arrangements in which the lamp is fed by pulses, e.g. flash lamp for single flash operation by measuring the incident light
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B15/00—Special procedures for taking photographs; Apparatus therefor
- G03B15/02—Illuminating scene
- G03B15/03—Combinations of cameras with lighting apparatus; Flash units
- G03B15/05—Combinations of cameras with electronic flash apparatus; Electronic flash units
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B2215/00—Special procedures for taking photographs; Apparatus therefor
- G03B2215/05—Combinations of cameras with electronic flash units
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Stroboscope Apparatuses (AREA)
- Discharge-Lamp Control Circuits And Pulse- Feed Circuits (AREA)
- Soil Working Implements (AREA)
- Massaging Devices (AREA)
- Lifting Devices For Agricultural Implements (AREA)
Abstract
PURPOSE:To prevent improper exposure, such as overexposure, due to erroneous commutation by announcing clearly the completion of light emission and dimming preparation by a tone. CONSTITUTION:As power source 11 is put to work, main and commutating capacitors 12 and 18 are charged. The charging voltage of main capacitor of main capacitor 12 is applied to the inverted input terminal of operational amplifier 28. Further, the charging voltage of capacitor 18 is applied to the inverted input terminal of this amplifier 28 and also applied to the inverted input terminal operational amplifier 24. When the charging voltage of main capacitor 12 does not reach the discharge starting voltage or when the charging voltage of commutating capacitor 18 does not reach the commutable voltage, the output of amplifier 28 is held at level H and when the charging voltage of commutating capacitor 18 does not reach the commutable voltage, the output of amplifier 24 is held at level H. Therefore, when main and comutating capacitors 12 and 18 are charged imcompletely, buzzer 33 is put into operation. Thus, improper exposure can be prevented.
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2387280A JPS56121022A (en) | 1980-02-27 | 1980-02-27 | Automatic dimming strobe device |
US06/236,903 US4344684A (en) | 1980-02-27 | 1981-02-23 | Automatic photoflash device |
AT81101453T ATE8557T1 (en) | 1980-02-27 | 1981-02-27 | AUTOMATIC FLASHING DEVICE. |
EP81101453A EP0035261B1 (en) | 1980-02-27 | 1981-02-27 | Automatic photoflash device |
DE8181101453T DE3164803D1 (en) | 1980-02-27 | 1981-02-27 | Automatic photoflash device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2387280A JPS56121022A (en) | 1980-02-27 | 1980-02-27 | Automatic dimming strobe device |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS56121022A true JPS56121022A (en) | 1981-09-22 |
Family
ID=12122530
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2387280A Pending JPS56121022A (en) | 1980-02-27 | 1980-02-27 | Automatic dimming strobe device |
Country Status (5)
Country | Link |
---|---|
US (1) | US4344684A (en) |
EP (1) | EP0035261B1 (en) |
JP (1) | JPS56121022A (en) |
AT (1) | ATE8557T1 (en) |
DE (1) | DE3164803D1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US11534503B2 (en) | 2017-12-28 | 2022-12-27 | Profusa, Inc. | Oxidase-based sensors and methods of using |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2719288A (en) * | 1953-06-11 | 1955-09-27 | Eastman Kodak Co | Circuit failure detecting device |
US3591829A (en) * | 1967-04-20 | 1971-07-06 | Minolta Camera Kk | Automatic control device for electronic flash |
US3626401A (en) * | 1969-03-19 | 1971-12-07 | Berkey Photo Inc | Fail to flash indicator circuit |
JPS522619B2 (en) * | 1972-05-30 | 1977-01-22 | ||
US3778672A (en) * | 1972-07-27 | 1973-12-11 | Ponder & Best | Audible alert signal for an electronic flash unit |
US3953928A (en) * | 1975-04-25 | 1976-05-04 | Great Lakes Carbon Corporation | Cooling of hot particulate material particularly calcined petroleum coke |
US3993928A (en) * | 1975-12-19 | 1976-11-23 | Honeywell Inc. | Extended range correct exposure annunciator |
US4122465A (en) * | 1976-06-23 | 1978-10-24 | Nippon Kogaku K.K. | Device for indicating condition of exposure in an automatic control type electronic flash unit for flash photography |
US4193677A (en) * | 1977-07-29 | 1980-03-18 | Nippon Kogaku K.K. | Warning circuit in an auto-controlled flashlight photographing device |
JPS5429036A (en) * | 1977-08-09 | 1979-03-03 | Mitsubishi Electric Corp | Numerical controller |
JPS5910718Y2 (en) * | 1978-05-18 | 1984-04-03 | ウエスト電気株式会社 | Notification device for automatic dimming electronic flash device |
-
1980
- 1980-02-27 JP JP2387280A patent/JPS56121022A/en active Pending
-
1981
- 1981-02-23 US US06/236,903 patent/US4344684A/en not_active Expired - Lifetime
- 1981-02-27 DE DE8181101453T patent/DE3164803D1/en not_active Expired
- 1981-02-27 AT AT81101453T patent/ATE8557T1/en not_active IP Right Cessation
- 1981-02-27 EP EP81101453A patent/EP0035261B1/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
ATE8557T1 (en) | 1984-08-15 |
EP0035261B1 (en) | 1984-07-18 |
US4344684A (en) | 1982-08-17 |
DE3164803D1 (en) | 1984-08-23 |
EP0035261A1 (en) | 1981-09-09 |
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